title: Evaluation of effect of different cavity disinfectants on shear bond strength of composite resin to dentin using two-step self-etch and one-step self-etch bonding systems: a comparative in vitro study.
abstract: OBJECTIVE
  To evaluate the effect of 2% chlorhexidine, 2% sodium hypochlorite, 3% hydrogen peroxide on shear bond strength of composite resin to dentin using two-step and onestep self-etch bonding systems and to study the mode of failure of specimens under stereomicroscope.
  
  
  METHODS
  Eighty extracted sound human posterior teeth were used. The occlusal surfaces were ground to expose the dentin and were then randomly divided into 4 main groups. In group I, no cavity disinfectant was used and served as control. In groups II, III, IV, 2% chlorhexidine, 2% sodium hypochlorite and 3% hydrogen peroxide were used as cavity disinfectants respectively. Each group was then divided into two subgroups of 10 teeth each according to the bonding agent used, two-step self-etch (Adper SE Plus) and one-step self-etch (Adper Easy One) respectively. A transparent cylindrical plastic tube was loaded with microhybrid composite and placed over the dentin and light cured for 40 seconds. The specimens were subjected to shear stress in the universal testing machine.
  
  
  RESULTS
  Pretreatment with 2% chlorhexidine, 2% sodium hypochlorite and 3% hydrogen peroxide, had a negative effect on the shear bond strength of self-etching bonding systems.
  
  
  CONCLUSIONS
  The highest bond strength was found in 2% chlorhexidine group followed by 2% sodium hypochlorite group and the lowest bond strength was found in 3% hydrogen peroxide group.
  
  
  CONCLUSIONS
  All three cavity disinfectants used in this study reduced the shear bond strength and hence should be used with caution.
authors.affiliation: Department of Conservative Dentistry and Endodontics, AECS Maaruti College of Dental Sciences and Research Center, Bengaluru, Karnataka, India.
authors.forename: M Surya Chaitanya
authors.initials: MS
authors.lastname: Reddy
authors.forename: M C
authors.initials: MC
authors.lastname: Mahesh
authors.forename: Shreetha
authors.initials: S
authors.lastname: Bhandary
authors.forename: J
authors.initials: J
authors.lastname: Pramod
authors.forename: Ashwija
authors.initials: A
authors.lastname: Shetty
authors.forename: M B
authors.initials: MB
authors.lastname: Prashanth
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods*; D000268:Adhesiveness; D002710:Chlorhexidine / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding; D003737:Dental Cavity Preparation / Q000379:methods*; D019551:Dental Disinfectants / Q000737:chemistry*; D003764:Dental Materials / Q000737:chemistry; D003799:Dental Stress Analysis / Q000295:instrumentation; D003804:Dentin / Q000648:ultrastructure*; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D006801:Humans; D006813:Humidity; D006861:Hydrogen Peroxide / Q000737:chemistry; D008422:Materials Testing; D033081:Shear Strength; D012973:Sodium Hypochlorite / Q000737:chemistry; D013314:Stress, Mechanical; D013499:Surface Properties; D013696:Temperature; D013997:Time Factors
chemical_list: D003188:Composite Resins; D019551:Dental Disinfectants; D003764:Dental Materials; D017220:Dentin-Bonding Agents; C444701:Filtek Z250; D006861:Hydrogen Peroxide; D012973:Sodium Hypochlorite; D002710:Chlorhexidine